GB1509426A - Radioelectric system for determination of the orientation of a moving body - Google Patents

Radioelectric system for determination of the orientation of a moving body

Info

Publication number
GB1509426A
GB1509426A GB2191075A GB2191075A GB1509426A GB 1509426 A GB1509426 A GB 1509426A GB 2191075 A GB2191075 A GB 2191075A GB 2191075 A GB2191075 A GB 2191075A GB 1509426 A GB1509426 A GB 1509426A
Authority
GB
United Kingdom
Prior art keywords
ship
amplitude
radar
horn
frequency
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB2191075A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by International Standard Electric Corp filed Critical International Standard Electric Corp
Publication of GB1509426A publication Critical patent/GB1509426A/en
Expired legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/74Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
    • G01S13/76Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein pulse-type signals are transmitted
    • G01S13/762Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein pulse-type signals are transmitted with special measures concerning the radiation pattern, e.g. S.L.S.
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S1/00Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
    • G01S1/02Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

1509426 Transponder beacon system INTERNATIONAL STANDARD ELECTRIC CORP 21 May 1975 [21 May 1974] 21910/75 Heading H4D In a secondary radar type system, the coded response signal, from a multi-element transponder mounted on a station having an orientation axis, e.g. a ship's heading direction, received at the interrogating land-based radar station, e.g. in a harbour at point P in Fig. 1, contains information which is extracted to give the value of the angle subtended by the orientation axis and a line intersecting both stations from which may be calculated, e.g. the magnetic bearing of the interrogated ship's heading direction. This value may then be communicated to the ship. As described the transponder comprises an arrangement of eight microwave horn systems Al to A8, Fig. 4, covering 360 degrees. Each hom system, e.g. Al, Fig. 3, comprises a reflecting short circuit Cl, and a phase shifting circuit controlled by a signal generator G I of frequency f1. A received interrogating radar signal at frequency F is phase modulated and retransmitted from the horn system at frequency F' +f1 where F' is the Doppler shifted radar interrogation signal frequency due to the motion of the ship. The angle between the boresights of all adjacent horn systems, e.g. A1 and A8, is 2α, which is known. Horn systems A1 to A8 respectively retransmit the interrogating signal modulated by known frequencies f 1 to f 8 whereby the retransmitted signals received at the radar station having the two largest amplitudes are used to identify an adjacent horn system pair, e.g. Al and A8 and the relative values of these two largest amplitude signals is used, in the case of systems A1 and A8 the bisector of the electrical axes of which corresponds to the ship's heading line MU to determine the angle #, Fig. 1. In the case where another horn pair, e.g. A5 and A6 retransmitting signals at frequencies F' + f5 and F<SP>1</SP>+f6 respectively, produce the largest amplitude received signals at the radar station, their relative amplitudes define a line (XX', Fig. 5, not shown) bisecting their respective electrical axes, but at a known angular relationship (i.e. 135 degrees, see Fig. 5, not shown) with the ship's heading direction MU which direction may be thereby calculated, at the harbour radar station, which comprises a rotating antenna 5, Fig. 3, a Doppler radar transmitter 3, a receiver 4, a frequency selection and amplitude detection circuit 6 which furnishes the amplitude of the received signals at frequencies F<SP>1</SP>+f1 and F<SP>1</SP>+f8, and a computer 7 which may comprise an amplitude discriminator (9, Fig. 6, not shown) which selects the two highest amplitude frequency components, e.g. F' +f5 and F' +f6. A decoding circuit (10) generated the angular difference between, e.g. line XX' and the heading direction MU, whereby the angle #, Fig. 1, may be calculated, and from which the ship's magnetic heading angle γ may be calculated. In other embodiments, each horn system amplitude modulates the retransmitted interrogation signal, and the transponder may be mounted ashore.
GB2191075A 1974-05-21 1975-05-21 Radioelectric system for determination of the orientation of a moving body Expired GB1509426A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7417552A FR2272403B1 (en) 1974-05-21 1974-05-21

Publications (1)

Publication Number Publication Date
GB1509426A true GB1509426A (en) 1978-05-04

Family

ID=9139087

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2191075A Expired GB1509426A (en) 1974-05-21 1975-05-21 Radioelectric system for determination of the orientation of a moving body

Country Status (3)

Country Link
DE (1) DE2521296C3 (en)
FR (1) FR2272403B1 (en)
GB (1) GB1509426A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2213016A (en) * 1979-05-30 1989-08-02 Siemens Ag Secondary radar transponders

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2444945A1 (en) * 1978-12-20 1980-07-18 Trt Telecom Radio Electr Interrogator and responder for radio location system - involves responder which operates frequency switching circuits for retransmission of signal via another antenna

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2213016A (en) * 1979-05-30 1989-08-02 Siemens Ag Secondary radar transponders
GB2213016B (en) * 1979-05-30 1990-05-30 Siemens Ag Secondary radar transponders

Also Published As

Publication number Publication date
DE2521296C3 (en) 1980-04-10
DE2521296B2 (en) 1979-08-09
FR2272403A1 (en) 1975-12-19
FR2272403B1 (en) 1978-01-13
DE2521296A1 (en) 1975-12-04

Similar Documents

Publication Publication Date Title
GB1453451A (en) Collision avoidance/proximity warning system using secondary radar
FI912068A0 (en) FOERFARANDE FOER PROCESSERING AV UTSAENDA OCH REFLECTOR SIGNALER FOER ATT ELIMINERA ICKEOENSKADE SIGNALER OCH BULLER FRAON OENSKADE SIGNALER.
GB940508A (en) Doppler radio navigation system
US3870993A (en) Distance measuring equipment for aircraft employing precision distance measuring means
US3320364A (en) System for phase coding information by blanking half cycles of a continuous periodicwave
GB1509426A (en) Radioelectric system for determination of the orientation of a moving body
US3394313A (en) Symmetrically phase modulated transmission system with multi-lobed modulating signals
US3290685A (en) Omni-range doppler beacons and direction finding systems
US3309708A (en) Tactical landing approach radio system
US3359554A (en) Radar-beacon system with two-way communication capability
US3859658A (en) Conical scan tracking system
GB994751A (en) Improvements relating to radio beacons
GB1473973A (en) Secondary radar system
US3778831A (en) Compatible double precision doppler omnidirectional bearing system
US3094697A (en) Frequency modulated approach beacon
US3343160A (en) Electronic navigation system
US3181141A (en) Rotating radio-beacon system for locating objects
Garfield TACAN: a navigation system for aircraft
US3331068A (en) Aircraft identifier
US3181142A (en) Air radio navigation control systems
US3587099A (en) Sector radio beacon
JPH02163685A (en) Airway monitoring device
US2912689A (en) Radio navigation system
GB648881A (en) Improvements in or relating to object detecting and locating systems utilizing reflection of electromagnetic waves
GB972529A (en) Omni-directional altimetric radar

Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee